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Me and my friends are trying to play our custom modpack together.

It contains:

Ars Magica 2

Animation API

Bibliocraft

Botania

Carpenter's Blocks

Chisel2

CodeChickenCore

Ex-Nihilo

ExtendedPotions

ironchest

Jabba

Mantle

MatterOverdrive

MorePlayerModels

NotEnoughItems

OpenBlocks

OpenModsLib

TConstruct

Witchery

Journeymap

Baubles

CodeChickenLib

Some of us can join, and play just fine. However some (usually me and 1 other) get the error:

and in the server this shows up:

[22:46:53] [Netty IO #5/INFO] [FML]: Client protocol version 2
[22:46:53] [Netty IO #5/INFO] [FML]: Client attempting to join with 25 mods : [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
[22:46:53] [Netty IO #5/INFO] [FML]: Attempting connection with missing mods [] at CLIENT
[22:46:54] [Server thread/INFO] [FML]: [Server thread] Server side modded connection established
[22:46:54] [Server thread/INFO] [net.minecraft.server.management.ServerConfigurationManager]: Erionan[/99.225.71.164:53330] logged in with entity id 25538 at (182.30706315712064, 70.0, 171.0674640593791)
[22:46:54] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Erionan joined the game
[22:46:56] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Erionan lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[22:46:56] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Erionan left the game

And sometimes this shows up:

[23:02:55] [User Authenticator #2/INFO] [net.minecraft.server.network.NetHandlerLoginServer]: UUID of player Erionan is 0eeb4b65-6509-4029-86ae-435ca0b95643
[23:02:55] [Netty IO #4/INFO] [FML]: Client protocol version 2
[23:02:55] [Netty IO #4/INFO] [FML]: Client attempting to join with 25 mods : [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
[23:02:55] [Netty IO #4/INFO] [FML]: Attempting connection with missing mods [] at CLIENT
[23:02:56] [Server thread/INFO] [FML]: [Server thread] Server side modded connection established
[23:02:56] [Server thread/INFO] [net.minecraft.server.management.ServerConfigurationManager]: Erionan[/99.225.71.164:53563] logged in with entity id 629 at (182.30706315712064, 70.0, 171.0674640593791)
[23:02:56] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Erionan joined the game
[23:02:56] [Netty IO #4/ERROR] [FML]: NetworkDispatcher exception
java.io.IOException: Broken pipe
at sun.nio.ch.FileDispatcherImpl.write0(Native Method) ~[?:1.8.0_77]
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) ~[?:1.8.0_77]
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93) ~[?:1.8.0_77]
at sun.nio.ch.IOUtil.write(IOUtil.java:51) ~[?:1.8.0_77]
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471) ~[?:1.8.0_77]
at io.netty.buffer.UnpooledUnsafeDirectByteBuf.getBytes(UnpooledUnsafeDirectByteBuf.java:408) ~[UnpooledUnsafeDirectByteBuf.class:?]
at io.netty.buffer.UnpooledUnsafeDirectByteBuf.readBytes(UnpooledUnsafeDirectByteBuf.java:414) ~[UnpooledUnsafeDirectByteBuf.class:?]
at io.netty.channel.socket.nio.NioSocketChannel.doWriteBytes(NioSocketChannel.java:214) ~[NioSocketChannel.class:?]
at io.netty.channel.nio.AbstractNioByteChannel.doWrite(AbstractNioByteChannel.java:178) ~[AbstractNioByteChannel.class:?]
at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:231) ~[NioSocketChannel.class:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:680) ~[AbstractChannel$AbstractUnsafe.class:?]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:260) ~[AbstractNioChannel$AbstractNioUnsafe.class:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:649) ~[AbstractChannel$AbstractUnsafe.class:?]
at io.netty.channel.DefaultChannelPipeline$HeadHandler.flush(DefaultChannelPipeline.java:1038) ~[DefaultChannelPipeline$HeadHandler.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) ~[ChannelOutboundHandlerAdapter.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.flush(DefaultChannelHandlerContext.java:655) ~[DefaultChannelHandlerContext.class:?]
at cpw.mods.fml.common.network.handshake.NetworkDispatcher.flush(NetworkDispatcher.java:447) ~[NetworkDispatcher.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:674) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:700) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:688) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:717) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:893) ~[DefaultChannelPipeline.class:?]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:239) ~[AbstractChannel.class:?]
at net.minecraft.network.NetworkManager$1.run(NetworkManager.java:174) [ek.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) [SingleThreadEventExecutor.class:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:348) [NioEventLoop.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [SingleThreadEventExecutor$2.class:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_77]
[23:02:57] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Erionan lost connection: TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: java.io.IOException: Broken pipe], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[23:02:57] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Erionan left the game

On the player's side the error is "A fatal error has occured, this connection is terminated"

Thats it, no crash report on either client or server.

We are using forge version 1.7.10-10.13.2.1230

And help/advice would be greatly appreciated.

Thanks.